Organophosphorverbindungen, 511) Phosphatriafulvene – Phosphaalkene mit inverser Elektronendichte2)

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Abstract
Organophosphorus Compounds, 511). – Phosphatriafulvenes – Phosphaalkenes with Inverse Electron Density2)Peterson olefination of the sterically hindered cyclopropenones 1 with the lithium phosphides 2 yields the so far unknown phophatriafulvenes 3 and 4, which possess inverse electron densities. They are characterized by transition metal complex formation (→7, 8). Acylation of 3a with the carboxylic acid chlorides 11 leads to a great variety of P‐acylphosphatriafulvenes 13a‐s. They partly dimerize under formation of the 1,3‐diphosphacyclobutanes 13 ⇌ 14.